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\textcolor{darkgray}{\LARGE Acknowledgement}
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This user's guide is constructed with contributions from distributed GSI developers. We give our special acknowledgement to these contributors and reviewers, including, but not limit to:

National Centers for Environmental Prediction (NCEP) Environmental Modeling Center (EMC): \\
John Derber, Russ Treadon, Mike Lueken, Wan-Shu Wu, Andrew Collard, and Ed Safford 

National Center for Atmospheric Research (NCAR): \\
Xiang-Yu Huang, Syed Rizvi, Zhiquan Liu, and Arthur Mizzi  

National Oceanic and Atmospheric Administration (NOAA) Earth System Research Laboratory (ESRL): \\
Steve Weygandt, Dezso Devenyi, and Joseph Olson

The GSI community support and code management effort is sponsored by NOAA's Office of Oceanic and Atmospheric Research (OAR). This work is also facilitated by NCAR. NCAR is supported by the National Science Foundation (NSF).

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